-0,5a(4-2a)(v+3)(v-5)(4a-3)(2a+1)7c^2(2c-9) = -0.5a(8a^2 - 4a)(v^2 - 2v - 15)(8a^2 - 3)(4a + 1)(14c^2 - 63c^2)= -4a(8a^2 - 4a)(v^2 - 2v - 15)(8a^2 - 3)(4a + 1)(14c^2 - 63c^2)= -32a^2( 2a - 1)(v^2 - 2v - 15)(8a^2 - 3)(4a + 1)(14c^2 - 63c^2)
-0,5a(4-2a)(v+3)(v-5)(4a-3)(2a+1)7c^2(2c-9) = -0.5a(8a^2 - 4a)(v^2 - 2v - 15)(8a^2 - 3)(4a + 1)(14c^2 - 63c^2)
= -4a(8a^2 - 4a)(v^2 - 2v - 15)(8a^2 - 3)(4a + 1)(14c^2 - 63c^2)
= -32a^2( 2a - 1)(v^2 - 2v - 15)(8a^2 - 3)(4a + 1)(14c^2 - 63c^2)